Setting up new vlans by ssid (multiple, unique) with a Ubiquiti edgerouter poe router and a UniFi Switch 48 POE-500W All access points are AP AC PRO or AP AC EDU. Any feedback on what to avoid or user experience of what really works best would be much appreciated.

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Any reason for a bunch of unique SSID's? if I read this right you are planning on a unique SSID and vlan for each AP? why? what is the requirement for it. You're creating a very complex system to try and manage if there are more than a few AP's in place. If you want to put all the SSID's on each ap then you create a whole bunch of overhead on your AP's.

What is the expected gain out of all the unique identities? Are these unique tenants or something that you want to segregate the traffic?

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We'll be setting up vlans by ssid with a total of 3 SSIDs across the network. Each AP will be broadcasting those 3 SSIDs.

just trying to manage network traffic a bit better in a device dense environment by getting each SSID on a vlan

Okay that makes more sense.

Short answer, you gain little by giving each SSID a vlan unless you need to segregate the traffic for security reasons. Chances are your AP's will choke out long before you have enough traffic that Vlan's provide help.